PSA to begin grading more Star Basketball cards, artist 'sketch' cards - Sports Collectors Digest
History of baseball card grading shows rise of PSA, BGS and SGC - Sports Collectors Digest
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CGC Trading Cards and CSG Will Combine to Become the World's Second-largest Card Grading Service | CGC
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Hobby searches for answers as PSA grading services halts card submissions - ESPN
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COMC Now Accepting HGA Graded Cards | COMC Blog
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